Study On The Application Of Silica And Carbon Black Reinforced Ssbr In Green Tire

With the increasing awareness of environmental protection and the increasing depletion of oil resources,the demand for green tires is also growing.The performance of the green tread rubber is not only related with the rubber type,is also associated with the reinforcing filler.Polystyrene butadiene rubber(SSBR)is more used in the tread of green tires,which has good wear resistance and wet skid resistance.In addition,silica filled rubber has low rolling resistance and high wet skid resistance,but poor wear resistance,while,the wear resistance of carbon black filled rubber is good,but the rolling resistance is higher.So,the complementary advantages and synergistic effects can be achieved through the use of silica and carbon black to fill rubber,which is of great significance to get the green tire tread the optimal formula and process parameters.In this paper,the silica/carbon black reinforced SSBR system was mainly studied.Firstly,the effects of silica/carbon black on the comprehensive properties of SSBR were studied.Most of the physical and mechanical properties were increased,the wet skid resistance was improved,adhesive content was increased,but the rolling resistance was decreased,the wear volume was increased,the wear resistance was also decreased.Besides,SEM analysis showed that the dispersion of the filler in the matrix was better with the increase of silica content.Comprehensive comparison of various performance changes,the synthetic performance of rubber was best when silica and carbon black were used in proportion to 60/20.The effects of black carbon black and carbon black with different particle sizes on the properties of the polystyrene butadiene rubber were investigated.The research showed that the smaller the particle size of carbon black was,the easier it was to adsorb the vulcanization promoting system,reinforcing effect of SSBR2564 S was more obvious,the worse the dispersion was in the rubber.Besides,with the increase of silica particle size,the Payne effect was decreased,and the processing performance became better,but most of the physical and mechanical properties were reduced.When silica was combined with carbon black N330,it had better synergistic effect.The effect of silane coupling agent Si69 content on the performance of tire tread was investigated.The research showed that the addition of Si69 could enhance the compatibility of filler and polymer,reduce the self-assembly of white carbon black,enhance the reinforcing effect.However,the amount of white carbon black is constant,the extra Si69 will play the role of plasticizer,so most of the physical properties of rubber increased first and then decreased with the increase of Si69 content.When the amount of Si69 was at 6phr,the comprehensive performance was the best.The influence of mixing process(rotor speed of the mixer and accelerator DPG adding order)on the properties of silica/carbon black reinforced SSBR was investigated.With the increase of rotor speed of mixer,the dispersion of silica in the rubber compound could be improved,the rolling resistance of mixing rubber was reduced,and the wet skid resistance was improved.The mechanical properties and wear resistance of SSBR2564 S were best when rotating speed was 80r/min.While adding DPG into mixed reaction stage of high temperature,silylation was accelerated between coupling agent and silica,the interaction was strengthened between filler and SSBR2564 S,and the dispersity of filler and the processing safety were improved,Payne effect was weaker,rolling resistance became better but wet skid resistance became worse.